Since day before yesterday, I have not been unable to run procedure on Oracle SQL Developer. When I click on Run button, progress bar with "Launching" text appears on the right bottom corner of the SQL Developer, and then it stuck in there.

In the Logging Page:
| Source
| Message
|
| oracle.dbtools.raptor.backgroundTask.RaptorTaskManager$1
| null at oracle.ide.Ide.getDefaultProject(Ide.java:499)
|
What is wrong with it?